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The American Concrete Institute

Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.

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International Concrete Abstracts Portal

Title: Impulse Testing of Concrete Beams

Author(s): F. T. Mavis and F. A. Richards

Publication: Journal Proceedings

Volume: 52

Issue: 9

Appears on pages(s): 93-102

Keywords: no keywords

Date: 9/1/1955

Abstract:The purpose of this study was to find out whether reinforced concrete beams that are identical except for grade of reinforcement behave alike or differently under identical impulses; and if they behave differently, how much-and why? Structural-grade bars, and hard-grade bars that had heen rolled with identical deformations from a billet of rail steel, were obtained from the same manufacturer. Reams were cast in gang molds with structural-grade and hard-grade bars alternating in adjacent beams. After the preliminary tests, concrete was supplied by truck mixer in large enough quantities so there should be no question about uniformity of concrete in any one batch. A new testing machine was designed and built to apply identical impulses to two beams in any given test, and instruments and methods wrro devised to record what happened at, any instant during a test. Things that occured simultaneously were recorded photographically at a rate of 64 exposures a second; and charts were synchronized to shorn load-deflection-time data with comparable precision.